Sökning: "Quantum Cascade Lasers"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden Quantum Cascade Lasers.

  1. 1. Simulation of Quantum Cascade Lasers

    Kandidat-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysik

    Författare :Zakaria Mohamed; [2023]
    Nyckelord :Quantum Cascade Lasers; Simulations; Numerical Methods; Computational Models; Heterostructures; Physics and Astronomy;

    Sammanfattning : This thesis aimed to contribute to the improvement of Quantum Cascade Lasers (QCLs) by focusing on the effective determination of quantum levels in these devices. The current method relies on an outdated Fortran code, which poses challenges when integrating into optimization schemes. LÄS MER

  3. 2. Doping Layers in Quantum Cascade Lasers: A study in doping density, position and migration effects

    Master-uppsats, Lunds universitet/Matematisk fysik

    Författare :Josefin Reftlér; [2022]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Quantum Cascade Lasers (QCLs) consist of several semiconductor materi- als sandwiched together. The QCL achieves stimulated emission in the mid-IR (m-IR) to the THz region of the electromagnetic spectrum by inter-subband transitions. These parts of the electromagnetic spectrum are hard to lase in with conventional means. LÄS MER

  4. 3. Simulation of THz Quantum Cascade Lasers

    Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Viktor Rindert; [2021]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Quantum Cascade Lasers (QCLs) have since their invention in 1994 become a crucial source for mid-infrared and THz radiation. Mid-infrared QCLs have achieved room temperature operation while THz QCLs have not. As such, simulations are an important tool in order to achieve a THz QCL operational at room temperature. LÄS MER

  5. 4. Simulating Quantum Cascade Lasers with the Position and Energy Resolving Lindblad approach

    Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Maitane Muñoz Basagoiti; [2019]
    Nyckelord :quantum cascade lasers; quantum transport; simulations; electron transport; Physics and Astronomy;

    Sammanfattning : Over the past two decades, Quantum Cascade Lasers (QCLs) have become an increasingly popular source for mid-infrared and terahertz radiation. Nowadays, their experimental development progresses fast with the aid of computer simulations. These reproduce carrier dynamics in the gain medium of the laser based on different transport models. LÄS MER

  7. 5. Electric Field Domains in Quantum Cascade Lasers

    Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysik

    Författare :Tim Almqvist; [2017]
    Nyckelord :quantum cascade laser; QCL; electric field domain; EFD; NDR; negative differential resistivity; simulations; Tim; Almqvist; kvantkaskadlaser; Physics and Astronomy;

    Sammanfattning : Quantum cascade lasers (QCLs) are periodic semiconductor heterostructures, capable of producing laser gain. They have become an important source of coherent radiation in the mid infrared, and THz frequency regions. QCLs are non-linear electric devices, and often have bias regions of negative differential resistivity (NDR). LÄS MER